Frequently Asked Questions about Milltek Sport exhausts

A selection of the most common questions that we get asked frequently from fitting the system, performance information and cleaning tips.

Power Gains

Q.

What sort of power gain can I expect to get?

A.

Each car has its own characteristics, and the power gain can vary greatly between them. 8-10% is about the most accurate general figure to cover all variations.

Pipe Diameters

Q.

What does it mean when you state the Pipe Diameter?

A.

Pipe sizes may vary from part-to-part. The pipe diameters we give are intended to be indicative of the system as a whole and do not necessarily mean every part is of a uniform size.

Sound Information

Q.

I want a sporty sound, but not one that is so loud that it wakes the neighbours or annoy me on a long journey. What sort of sound do your systems produce?

A.

As our slogan states, 'Performance to blow your mind, not your ears!' our engineers' mission is to find the perfect balance between maximum performance increase while maintaining a responsible noise level. We DO NOT produce boy-racer style exhaust systems that can be heard from miles away. Our systems are designed to appeal to enthusiasts of all levels and the main way of controlling this is by offering resonated and non-resonated versions of most of our systems - see below for further information about the differences between resonated and non-resonated).

Q.

What is a resonator and what's the difference between a resonated and non-resonated exhaust system?

A.

A resonator is a chamber in the exhaust system that contains a specific volume of air which is designed to cancel out certain frequencies of sound (made by the engine) - making the exhaust noise quieter.

Therefore, a non-resonated exhaust system will give you extra performance and a louder exhaust note and the resonated system will give you extra performance without increasing the exhaust noise much.

Legal Information

Q.

Is it legal to de-cat my car?

A.

De-catting a car in the UK registered after 1993 is illegal as it will fail an emissions check.

Q.

What alternative do I have to a de-cat?

A.

A Hi-Flow cat will increase flow by as much as 30% over the original manufacturers unit.

Purchasing

Q.

Can I buy parts individually (e.g. can I buy just the cat, or just the downpipes or backbox)?

A.

Hi-Flow cats are available as stand-alone purchases, otherwise units are sold as either cat back or rear box only, because Milltek are genuine performance systems you can't mix and match.

Fitting

Q.

Will I need to modify my vehicle in order to fit Milltek products?

A.

No. Our products are direct replacements for the original systems and come with everything needed to fit them. There are some vehicles that may require different rear valances to be fitted to allow tailpipes to exit the rear bumper (e.g. VW Golf Mk4) but this will be made clear to you.

Fitting the systems is very straightforward and can usually be done by any reasonably competent DIY mechanic. However, you could always get a quote from your local garage / Milltek dealer for fitting. Alternatively, you can download our exhaust fitting guide.

Aftersales Care

Q.

Is my exhaust system covered by a guarantee or warranty?

A.

As long as you are the original purchaser, cat-back exhaust systems are covered by an anti-corrosion and manufacturing defect warranty and hi-flow sports catalysts and downpipes are covered by a 2 year or 80,000km warranty. We do not cover against any modifications made to our product after it has left our factory and also not for unusual use of the parts - for example, the use of Nitrous Oxide (NOS), aftermarket launch-control systems, damage caused by going over a speed bump too fast etc. Our warranties are offered on the understanding that the cars power maybe increased by up to 33% from its original specification but exclude improper modification. Modifications made to increase the power beyond this will render the warranty void.

We pride ourselves on our after-sales support and customer service and will look into each case on an individual basis.

All warranty cases should be dealt with by the Milltek appointed distributor from whom you purchased the system. However, if you are dissatisfied with the service of your distributor in response to your claim, you can contact us directly by emailing us at techsupport@millteksport.com.

Please note: Milltek Sport hi-flow sports catalysts are manufactured from the highest quality materials and built with maximum performance and longevity in mind. However, they are designed to work specifically in conjunction with other Milltek Sport products and should not be used on their own (with the OEM exhaust system) or with other manufacturers exhaust systems. If the Milltek catalysts are fitted with non-Milltek exhaust systems, we are unable to provide any guarantee regarding noise quality, fit, performance or warranty against their operation.

Cleaning Tips

Q.

How do I clean my stainless steel tailpipes without scratching or damaging them?

A.

It is important to note that if you don't clean your tailpipes regularly (and we know that some of you don't :) ), they will suffer from discolouration and become harder to clean. Because of the high-quality stainless steel, you will always be able to get them back to looking brand new (without any degradation in the materials), but the longer you've left it without cleaning them, the harder it will be!

After several months of testing in all markets and weather conditions, we have released our own Milltek Sport tailored metal polish that will render any stainless steel exhaust system or metal component ready for concours or show duty, with the minimum of effort. Perfect not only for keeping your Milltek system in tip-top condition, but also any other polished or chromed parts on your car (or bike!) too. Find out more about Milltek Sport Metal Polish.